Ethereum 以太坊事件未显示，但功能已完成

我有以下合同：

Contract Store{

    event Purchase(address buyer, int item_id);

    struct Product {
        string name;
        uint price;
        string desc;
        uint quantity;
        bool enabled;
    }

    mapping (address => int) balances;

    function buyProduct(uint id) returns(bool){
        if(products[id].quantity <= 0){ return false; }

        balances[msg.sender] = balances[msg.sender] - int(products[id].price);
        products[id].quantity--;
        Purchase(msg.sender, id);
        return true;
      }

}

---

啊。它刚刚开始工作，我正在向事件传递一个

uint

，但它期望一个

int

var eventFilter = Store.deployed().Purchase({from: "0xe02b4fc50f429624937e9425e1243292857291e2"}, {fromBlock: 0, toBlock: 'latest'});

eventFilter.watch(function(error, event){
    console.log('hai');
    console.log(event);
});